Study of Antiultraviolet Asphalt Modifiers and Their Antiageing Effects

María Inmaculada García Hernández,Wenhua Xie,Wenbo Zeng,Jinxuan Hu,Shaopeng Wu,Quantao Liu

doi:10.1155/2017/9595239

María Inmaculada García Hernández, Wenhua Xie + Show 4 more

Open Access

https://doi.org/10.1155/2017/9595239

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Abstract

Ultraviolet (UV) radiation causes serious ageing problems on pavement surface. In recent years, different UV blocking materials have been used as modifiers to prevent asphalt ageing during the service life of the pavement. In this study, three different materials have been used as modifiers in base asphalt to test their UV blocking effects: layered double hydroxides (LDHs), organomontmorillonite (OMMT), and carbon black (CB). UV ageing was applied to simulate the ageing process and softening point, penetration, ductility, DSR (Dynamic Shear Rheometer) test, and Fourier Transform Infrared Spectroscopy (FTIR) test were conducted to evaluate the anti-UV ageing effects of the three UV blocking modifiers. Physical property tests show that base asphalt was influenced more seriously by UV radiation compared to the modified asphalt. DSR test results indicate that the complex modulus of asphalt before UV ageing is increased because of modifiers, while the complex modulus of base asphalt after UV ageing is higher than that of the modified asphalt, which shows that the UV blocking modifiers promote the antiageing effects of asphalt. FTIR test reveals that the increment of carbonyl groups and sulfoxide groups of modified asphalt is less than that in base asphalt. Tests indicate the best UV blocking effect results for samples with LDHs and the worst UV blocking effect results for samples with CB.

Highlights

Asphalt has been used for road construction for more than a century [1,2,3]
After the UV ageing process, all the samples present an increment in the softening point and the Base asphalt (BA) showed the highest increment compared to the three modified asphalt samples, which means that the anti-UV ageing materials could alleviate the UV ageing of asphalt
The results indicate that the anti-UV ageing effect of asphalt is improving with the additives and the anti-UV ageing effects of layered double hydroxides (LDHs) and OMMT are better than carbon black (CB), which is in concordance with results of complex modulus

Summary

Introduction

Asphalt has been used for road construction for more than a century [1,2,3]. Compared with cement pavement, asphalt pavement has remarkable advantages in comfortableness and smoothness [4, 5]. A set of complex physicochemical processes happen because of the exposition of the asphalt pavement to UV radiation and result in a harder and more brittle asphalt [6, 7]; as a result, low temperature cracking and fatigue cracks are more likely to occur on the pavement [8, 9]. Under these circumstances, it is an urgent task to develop the method to prevent the ageing of asphalt. Studies [13] have shown that UV radiation after RTFOT could age a thin film of asphalt to the same ageing level as the one aged by PAV in a few hours

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Conclusion